# Free arrangements and relation spaces

Discrete & Computational Geometry, Jul 1994

Yuzvinsky [7] has shown that free arrangements are formal. In this note we define a more general class of arrangements which we callk-formal, and we show that free arrangements arek-formal. We close with an example which distinguishesk-formal arrangements from formal arrangements.

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K. A. Brandt, H. Terao. Free arrangements and relation spaces, Discrete & Computational Geometry, 1994, 49-63, DOI: 10.1007/BF02574365